what are two standard elements
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10.1 Gaseous Elements and Compounds All chemical substances are either solid, liquid or gas. The standard state of a chemical substance is its phase (solid, liquid, gas) at 25.0 °C and one atmosphere pressure. Two elements are liquid in their standard state: mercury and bromine. Eleven elements are gas in their standard state. All of the noble gases (He, Ne, Ar, Kr, Xe, Rn) as well the halogens flourine and chlorine. Hydrogen, oxygen and nitrogen are the others. All other elements are solid in their standard state.
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Water Molecule Structure Standard heavy water (D2O) has the same oxygen isotopic composition but 100% deuterium and molar mass 20.027508 g mol-1 [IAPWS]. With stocks of VSMOW being used up, they have been succeeded by VSMOW2 , a standardized artificial pure salt-free water isotopic mixture made to deliver the same isotopic concentrations.
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Hydrogen and Oxygen Water is a compound made up of two elements—hydrogen and oxygen. The characteristic properties of these elements are different from those of water. However, hydrogen and oxygen have some common properties. They are both colorless, odorless gases , and they both readily react with other elements—making them reactive elements. But in many ways they are very different from each other.
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Atomic weight Since 1961 the standard unit of atomic mass has been one-twelfth the mass of an atom of the isotope carbon-12. An isotope is one of two or more species of atoms of the same chemical element that have different atomic mass numbers (protons + neutrons).
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- Review: An element contains just one type of atom. A compound contains two or more different atoms joined together. A mixture contains two or more different substances that are only physically joined together, not chemically. A mixture can contain both elements and compounds.
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- You can see an example below: The metals are to the left of the line (except for hydrogen, which is a nonmetal); the nonmetals are to the right of the line; and the elements immediately adjacent to the line are the metalloids. When elements combine to form compounds, two major types of bonding can result. IONIC BONDS form when there is a transfer of electrons from one species to another, producing charged ions which attract each other very strongly by electrostatic interactions.
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How does an element differ from a compound? Compounds often have completely different properties to the  elements that formed them. For example, sulphuric acid (H2SO4),  which is made up of two atoms of hydrogen, one of sulphur, and four  of oxygen is a colorless, odorless liquid that is highly corrosive  (eats easily through skin and other materials).
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Transistor Types of transistor. Transistor circuit symbols. There are two types of standard transistors, NPN and PNP, with different circuit symbols. The letters refer to the layers of semiconductor material used to make the transistor.Most transistors used today are NPN because this is the easiest type to make from silicon.here are two types of standard transistors, NPN and PNP, with different circuit symbols. The letters refer to the layers of semiconductor material used to make the transistor.
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Reactions of Main Group Elements with Halogens Water is a compound, but Hydrogen and Oxygen are elements. Water is H2O, with 2 Hydrogen atoms and an Oxygen atom. Elements are only one type of atom, but compounds can be composed of multiple elements. For example, Fluorine and Oxygen are elements, but Dioxygen Difluoride is a compound.
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- A pure metal is an element. Some metals are alloys, which mean they have more than one metal or element in them. The metal bronze is made … of two elements, the metal tin and the metal copper.his means that Lithium is the least reactive of the Group 1 elements and Francium the most reactive. Francium is radioactive and does not exist in large quantities, so practically caesium is the most reactive. Lithium, when placed on the surface of some water fizzes vigorously.
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4.2 Types of Chemical Reactions: Single- and Double-Displacement Reactions A double-replacement reactionA chemical reaction in which parts of two ionic compounds are exchanged. occurs when parts of two ionic compounds are exchanged, making two new compounds. A characteristic of a double-replacement equation is that there are two compounds as reactants and two different compounds as products. Recognize chemical reactions as single-replacement reactions and double-replacement reactions. 2  Use the periodic table, an activity series, or solubility rules to predict whether single-replacement reactions or double-replacement reactions will occur.
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What is O2 and O3? The simple substances of the chemical element oxygen are oxygen(O2) and ozone(O3). They are the two allotropic forms of the same chemical element. Allotropy is the ability of a chemical element to exist in the form of more than one elementary substances.3, is Ozone which is formed by splitting the oxygen molecule and recombining with another oxygen molecule. This usually happens due to an electrical spark or lightning, or by interaction with pollutants in the atmosphere. Ozone is also formed in the upper atmosphere by interaction with sunlight.
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- Bromine is one of only two elements that is a liquid under normal conditions. Bromine is one of only two elements that is a liquid under normal conditions.
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Whole Lotta Rules Going On When you have two different elements, there are usually only two words in the compound name. The first word is the name of the first element. The second word tells you the second element and how many atoms there are in the compound. The second word usually ends in IDE. That's the suffix.
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- The only chemical elements which are stable single atom molecules at standard temperature and pressure (STP), are the noble gases. These are helium, neon, argon, krypton, xenon and radon. The heavier noble gases can form chemical compounds, but the lighter ones are non-reactive or inert. For example, helium, being the simplest noble gas, has only two electrons, thus meaning it is satisfied with a complete outer shell, making it relatively non-reactive, hence it is a noble gas.
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Nonmetal Notes. 1  The standard state of an element (with one exception) is the most thermodynamically stable form of the element at ambient conditions. The exception is phosphorus, the standard state of which is the white allotrope, the most thermodynamically unstable, as well as the most volatile and reactive form.
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MADMAN BIOLOGY Hydrogen and oxygen are elements. What that really means is that when an atom, the fundamental unit that makes up everything, has 1 proton (a positively charged sub-atomic particle) it is a hydrogen atom, and when it has 8 protons, it is an oxygen atom.Hydrogen gas is two hydrogen atoms bonded together, H 2.Oxygen gas is two oxygen atoms bonded together, O 2. Water, is one oxygen atom bonded to two different hydrogen atoms, H 2 O. When atoms are bonded together, (H 2, O 2, H 2 O etc.) we call the total structure a molecule.ydrogen and oxygen are elements. What that really means is that when an atom, the fundamental unit that makes up everything, has 1 proton (a positively charged sub-atomic particle) it is a hydrogen atom, and when it has 8 protons, it is an oxygen atom.
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- Period 1 contains two elements (H-He), corre-sponding to the ﬁlling of the ﬁrst electronic shell, which can hold a maximum of only two electrons. These elec-trons are referred to as s-electrons because they give rise to the so-called “sharp” lines found in the spectra of the atoms in question.
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Chapter 4.1 Elements are pure substances that cannot be broken down. A compound is a substance containing two or more elements that are chemically combined in a fixed ratio. Give an example showing the importance of trace elements to the human body. Iron only makes up 0.004% of your body mass but it is essential for carrying oxygen in your blood.
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- Test 1: Introduction to Chemistry. Name: ____________________________________. Sunday, October 14, 2007. 1. Two substances, A and Z, are to be identified. Substance A can not be broken down by a chemical change. Substance Z. can be broken down by a chemical change.
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- The elements in group 1 and 2 are the representative elements. Groups 3 through 12 are the transition elements. Transition elements are all metals and are found less noticably … than they do across a period of representative elements. representative elements are always found in nature combined with other elements, they are all metals except for hydrogen.
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Ideal Gas Law Standard Temperature and Pressure STP is used widely as a standard reference point for expression of the properties and processes of ideal gases. The standard temperature is the freezing point of water and the standard pressure is one standard atmosphere. These can be quantified as follows: Standard temperature: 0°C = 273.15 K
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What are the differences between elements, compounds and mixtures? A molecule is simply two or more atoms chemically bonded together. A molecular element, is two atoms or more of the same element bonded together. E.g. two hydrogen atoms will form H2. A molecular compound is two atoms or more of different elements bonded together. E.g. 2 Hydrogen atoms and 1 Oxygen atoms chemically bonded can be H2O - Water.
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Standard enthalpy of formation For a pure substance or a solvent in a condensed state (a liquid or a solid): the standard state is the pure liquid or solid under a pressure of 1 bar; For an element: the form in which the element is most stable under 1 bar of pressure. One exception is phosphorus, for which the most stable form at 1 bar is black phosphorus, but white phosphorus is chosen as the standard reference state for zero enthalpy of formation. For example, the standard enthalpy of formation of carbon dioxide would be the enthalpy of the following reaction under the conditions above:
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- 1 consists of atoms of two or more different elements bound together, 2  can be broken down into a simpler type of matter (elements) by chemical means (but not by physical means),  has properties that are different from its component elements, and.
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Periodic table Period 2 and Period 3 both have 8 elements. Other periods are longer. Elements in a period have consecutive atomic numbers. A column of elements down the table is called a group. There are 18 groups in the standard periodic table. Each group has a number: from 1 to 18. Elements in a group have electrons arranged in similar ways, which gives them similar chemical properties (they behave in similar ways).